shared/runtime/mpirq: Check separate hard IRQ stack correctly.

On the zephyr port, hard IRQ handlers run with a separate stack on a
different thread, so each call to mp_irq_dispatch() and mp_irq_handler()
has to be wrapped with adjustments to the stack-limit checker.

Move these adjustments into the shared mp_irq_dispatch(), introducing
MICROPY_STACK_SIZE_HARD_IRQ which a port can define to non-zero if it
uses a separate stack for hard IRQ handlers. We only need wrap the hard
dispatch case. This should reduce binary size on zephyr without affecting
other ports.

Signed-off-by: Chris Webb <chris@arachsys.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/ports/zephyr/machine_i2c_target.c b/ports/zephyr/machine_i2c_target.c
index 236f13348..c7786e7df 100644
--- a/ports/zephyr/machine_i2c_target.c
+++ b/ports/zephyr/machine_i2c_target.c
@@ -114,14 +114,7 @@ static inline size_t mp_machine_i2c_target_get_index(machine_i2c_target_obj_t *s
 }
 
 static void mp_machine_i2c_target_event_callback(machine_i2c_target_irq_obj_t *irq) {
-    char dummy;
-    void *orig_top = MP_STATE_THREAD(stack_top);
-    mp_uint_t orig_limit = MP_STATE_THREAD(stack_limit);
-    MP_STATE_THREAD(stack_top) = &dummy;
-    MP_STATE_THREAD(stack_limit) = CONFIG_ISR_STACK_SIZE - 512;
     mp_irq_handler(&irq->base);
-    MP_STATE_THREAD(stack_top) = orig_top;
-    MP_STATE_THREAD(stack_limit) = orig_limit;
 }
 
 static size_t mp_machine_i2c_target_read_bytes(machine_i2c_target_obj_t *self, size_t len, uint8_t *buf) {